Fire-alarm signal



May 18 1926. 1,585,122

G. A. SHAFFER FIRE ALARM SIGNAL Filed Oct. 2 8, 19

M 0 0 a w -3 1:; o o o o o 6 o a I o o 8 0 l3 Patented May 1a, 1926.

UNITED STATES GEORGE A. SHAFFER, OF PEBRYVILLE, MARYLAND.

FIRE-ALARM SIGNAL.

Application filed October 28, 1924. Serial No. 745,286.

This invention relates to improvements in fire alarm signals, and has for its object to provide a simple and efiicientdevice which can be located in any desired position in a building and which is connected with each room, or part, of the building so that the alarm will be automatically given no matter in which part of the building the fire may start, and from an examination of the device after the alarm is given the exact location of the fire can be ascertained.

The invention consists of the novel construction and arrangement of the parts and combination of parts hereinafter more fully set forth in the following specification and pointed out in detail in the appended claim.

In the accompanying drawings,-

Figure 1 is a top plan view of my inventlon.

Figure 2 is a section on the line 2-2 of Figure 3.

Figure 3 is a section on the line 3-3 of Figure 1.

Figure a is a similar view of Figure 3 showing one of the alarm fingers released and forcing the push button against the contact plates causing the latter to contact and sound the alarm.

Referring to the accompanying drawings, forming part of this specification, and in which like reference numerals designate like parts throughout the several views thereof, 1 designates the base having a central aperture 2 in which the push button 3 operates. Just above the aperture 2 and in line with the push button 3 are two contact plates 4: and 5 secured to the outer surface of the base 1 by the screws 6 and connected by the wires 7 in circuit with a. bell, or other indicator, to give the alarm, The free ends of the contact plates fh and 5 are in close proximity to each other and are adapted to be forced together to close the circuit by the push button 3 when one or more of the alarm fingers 8 are released. The said alarm fingers 8 are each pivoted at 9 to the inner surface of the base 1 and are arranged radially with respectto the push button 3 and their free ends are adapted to strike the head of the push but ton 3 when released. Each of the fingers 8 is provided with a bolt 10 projecting through the base 1 and having a coiled spring 11 between its head and the bottom of the recess 12 of the said base. These fingers 8 are enclosed in a case 13 and are each provided with a cord 14 secured to its free end and which passes over a pulley 15 and out through an aperture 16 to the desired room, or part, of the building, where it is secured. Any number fingers 8 may be employed according to the number of rooms or locations in which it is desired to connect the device. The ends of the cords 1e are secured in the rooms or other locations so that the fingers 8 will be held down against the action of the coiled springs 11 and out of contact with the push button 3. As soon as fire starts and one of the cords 14 is burned the finger 8 connected thereto will be released and the action of the coiled spring 11 will cause it to be forced against the push button 3 which in turn will cause the contact plates 5 to contact and establish the circuit to the bell or other alarm, and by observing which cord has been burned it can be easily ascertained in which room or location of the building the fire has started.

Having thus described my invention, what I claim is:

A fire alarm signal comprising a case having a number of openings in its sides, a base forming part of said case and having a central aperture therethrough, a push button fitted in the said central aperture, contact plates secured to the outer surface of said base and in alignment with said central aperture and adapted to be connected in circuit with a suitable indicator, a number of contact fingers each of which is pivoted at one end to the inner surface ot' said base and having its free end adapted to operate said push button, a number of pulleys secured in said case, a cord connected to the free end of each of said [ingers to hold them normally out of contact with the said push button, each of said cords pass over one of said pulleys and out through one of the said openings in the side of the case, and means to force the said fingers into contact with the push button when the said fingers are released.

In testimony whereof I affix my signature.

GEORGE A. SI-IAFFER. 

